If you change the read to read into an array, you can access each member of the array by index.
e.g.
Code:
unset line
while IFS=_ read -A line; do
NF=$((${#line[@]}-1))
echo ${line[(($NF))]} # last field
echo ${line[(($NF-1))]} # second last field
done < file
You could combine those two echo lines inside the while-loop with:
Code:
echo ${line[((${#line[@]}-1))]} # last field
echo ${line[((${#line[@]}-2))]} # second last field
but it's a bit messier to look at.
this works for bash:
Code:
#!/bin/bash
DATA="bblah1_blah2_blah3_blah4_blah5
bblahA_blahB_blahC_blahD_blahE"
printf '%s\n' "${DATA}" | while IFS=_ read -a line; do
NF=$((${#line[@]}-1))
echo ${line[(($NF-1))]}
done
but does not work for for sh. i get the following error:
Code:
read: Illegal option -a
if i try with the original -A which you had, i still get:
Code:
read: Illegal option -A
i care about this because there are some old systems we have here that dont have bash. they just have sh. systems such as AIX, SunOS.
I am executing a stored proc and sending the results in a log file. I then want to grab one result from the output parameters (bolded below, 2) so that I can store it in a variable which will then be called in another script. There are more details that get printed in the beginning of the log file,... (3 Replies)
Hello all I hope someone can help me. I am trying to convert something I wrote in C to bash.
But how do I go about reading more than one item at a time in a for loop?
i have been using this format for the loops in the bash script i have been building.
e.g.
for word in `cat -s... (4 Replies)
I have a process that is running locally on the machine.
When you telnet to the process: telnet IP port, it automatically returns a string which shows the status of that process.
Something like this:
# telnet IP Port
Trying 127.0.0.1...
Connected to localhost (127.0.0.1).
Escape... (3 Replies)
ok, so a script i wrote spits out an output like the below:
2,JABABA,BV=114,CV=1,DF=-113,PCT=99.1228%
as you can see, each field is separated by a comma. now, how can I get rid of the first field and ONLY show the rest of the fields.
meaning,
i want to get rid of the "2,", and... (3 Replies)
Hi,
I am trying to implement a server monitoring dashboard using cgi scripting. I am planning to run the necessary unix scripts from the web page using cgi. This method works fine for standard unix commands but I am unable to run some external unix commands (like swadm show_processes, swadm... (9 Replies)
Hi,
my script is setting a variable with value and this variable is present in my another command that is coming from external file and this command is internally called after this variable is set. but while execution of this command, the value is not retrieved properly.
say,
my script... (5 Replies)
Hello everyone,
I am doing some sort of analysis for some data about organic solvents, and I have a problem with writing a command to do this:
Here's a sample of my file:
1 ethanol
2 methanol
3 methanol/ethanol
4 ethanol/methanol
5 ethanol/DMF
6 ethyl... (6 Replies)
I have several .csv files containing data like this:
field_1;field_2;date;comment;amount;
I want to extract the 3 last fields and load them in a database.
my input_file = "/dir/file.csv";
my output_file = "/dir/file.sql";
open my $csv_file, '<', $input_file
or die "Can't... (1 Reply)
Hey guys, I am working on a script that needs to grab variables from a log file. The script will run morning 9 to 5pm and save variables for each run every hour, these results I will be aggregating at the end of the day.
I am thinking I will be placing the date on each entry in the log every... (7 Replies)
Discussion started by: mo_VERTICASQL
7 Replies
LEARN ABOUT PHP
echo
ECHO(3) 1 ECHO(3)echo - Output one or more stringsSYNOPSIS
void echo (string $arg1, [string $...])
DESCRIPTION
Outputs all parameters.
echo is not actually a function (it is a language construct), so you are not required to use parentheses with it. echo (unlike some other
language constructs) does not behave like a function, so it cannot always be used in the context of a function. Additionally, if you want
to pass more than one parameter to echo, the parameters must not be enclosed within parentheses.
echo also has a shortcut syntax, where you can immediately follow the opening tag with an equals sign. Prior to PHP 5.4.0, this short syn-
tax only works with the short_open_tag configuration setting enabled.
I have <?=$foo?> foo.
PARAMETERS
o $arg1
- The parameter to output.
o $...
-
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
echo examples
<?php
echo "Hello World";
echo "This spans
multiple lines. The newlines will be
output as well";
echo "This spans
multiple lines. The newlines will be
output as well.";
echo "Escaping characters is done "Like this".";
// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";
echo "foo is $foo"; // foo is foobar
// You can also use arrays
$baz = array("value" => "foo");
echo "this is {$baz['value']} !"; // this is foo !
// Using single quotes will print the variable name, not the value
echo 'foo is $foo'; // foo is $foo
// If you are not using any other characters, you can just echo variables
echo $foo; // foobar
echo $foo,$bar; // foobarbarbaz
// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "
";
echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;
// Because echo does not behave like a function, the following code is invalid.
($some_var) ? echo 'true' : echo 'false';
// However, the following examples will work:
($some_var) ? print 'true' : print 'false'; // print is also a construct, but
// it behaves like a function, so
// it may be used in this context.
echo $some_var ? 'true': 'false'; // changing the statement around
?>
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
SEE ALSO print(3), printf(3), flush(3), Heredoc syntax.
PHP Documentation Group ECHO(3)